I agree with the other moms about the middle class being left behind. We are a one income family (I'm a SAHM) with my husband making OK money. That being said, we have sent (are sending) both our boys to preschool.
With my first son we had him a kinder-readiness program at his school last year (a very reasonably priced school). He started the year w/3 days a week and ended it with 5. They did a wonderful job of teaching them the letters/phonics, writing letters, etc. My son is an exceptional reader naturally (started kindergarten this year reading at almost a 2nd grade level), so we really haven't worked much at home with him, just recreational reading or educational games (and video games/DVD's).
My second son is now 3, but has 2 more years until kindergarten. He is in the PALS program (speech program in McKinney) right now, so that may effect what program he goes to when he's four (year after next). We currently have him in the same school with his older brother 2 days a week and PALS 2 days a week (only 2 hours long). We will keep him at 2 days next year also, but when he is four I'd like to put him in the kinder-readiness program like his big brother. I was very impressed with the program, but it will all depend if he's still in PALS at that point.
We have never done workbooks, flashcards, etc. with our children. Instead we just integrate learning into everyday. We pick out letters and words on signs, while shopping, etc. Both my boys learned sight words very early this way. For early math, I have them count out produce for me or have them tell me how much something costs, etc. They love "helping" mommy this way and it's not a chore to them. We practice writing by writing "notes" to grandma/daddy, etc, which also fun. I try to keep my kids in activities and social so that they are well socialized and confident around other children by the time they are in school.
Like one of the other ladies mentioned, we'd like to hear what a kindergarten teacher likes to see her students know. Also, we put our older son in private school this year for kindergarten (long story) and I was just wondering what the public schools teach vs his private school. They are doing reading (phonics/sight words), simple addition, telling time, counting money, simple science, spanish and of course writing (they started journals after Christmas break). I know there are other things, but those are the main things.
Thanks for such a great question.